Description
A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libarchive | 3.8.9-1 | — |
| Debian 13 | libarchive | No fix yet | — |
| Debian 12 | libarchive | 3.6.2-1+deb12u5 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libarchive | 3.8.5-1ubuntu2.3 | USN-8902-1 |
| Ubuntu 24.04 LTS | libarchive | 3.7.2-2ubuntu0.9 | USN-8902-1 |
| Ubuntu 22.04 LTS | libarchive | 3.6.0-1ubuntu1.9 | USN-8902-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libarchive | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libarchive | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libarchive | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libarchive | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | bsdtar +2 | 3.7.7-11.el10_2 | RHSA-2026:69553 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | bsdcat +5 | 3.8.8-3.1.hum1 | RHSA-2026:43818 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | bsdtar +2 | 3.7.7-11.el10_2 | ALSA-2026:69553 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libarchive | 3.7.7-11.el10_2 | RLSA-2026:69553 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libarchive | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | bsdtar +2 | 3.7.7-11.el10_2 | ELSA-2026-69553 |
Advisories 7
- ALSA-2026:69553 Low: libarchive security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:43818 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:69553 Red Hat Security Advisory: libarchive security update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- USN-8902-1 libarchive vulnerability Ubuntu Security Notices (USN) · Oct 9, 2026
- WID-SEC-2026-2456 libarchive: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Sep 23, 2026
- RLSA-2026:69553 Low: libarchive security update Rocky Linux Security Advisories · Sep 23, 2026
- ELSA-2026-69553 Low: libarchive security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 23, 2026
References
- RHSA-2026:43818 vendor-advisory
- RHSA-2026:69553 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-16517 vdb-entry
- RHBZ#2505492 issue-tracking